110 lines
3.2 KiB
C
110 lines
3.2 KiB
C
|
/*
|
||
|
|
* Copyrught 2005 Kean Johnston <jkj@sco.com>
|
||
|
|
* Copyright 1990,91 by Thomas Roell, Dinkelscherben, Germany
|
||
|
|
* Copyright 1993 by David Wexelblat <dwex@goblin.org>
|
||
|
|
*
|
||
|
|
* Permission to use, copy, modify, distribute, and sell this software and its
|
||
|
|
* documentation for any purpose is hereby granted without fee, provided that
|
||
|
|
* the above copyright notice appear in all copies and that both that
|
||
|
|
* copyright notice and this permission notice appear in supporting
|
||
|
|
* documentation, and that the names of Thomas Roell, David Dawes
|
||
|
|
* and Kean Johnston not be used in advertising or publicity pertaining to
|
||
|
|
* distribution of the software without specific, written prior permission.
|
||
|
|
* Thomas Roell, David Dawes and Kean Johnston make no representations
|
||
|
|
* about the suitability of this software for any purpose. It is provided
|
||
|
|
* "as is" without express or implied warranty.
|
||
|
|
*
|
||
|
|
* THOMAS ROELL, DAVID DAWES AND KEAN JOHNSTON DISCLAIM ALL WARRANTIES
|
||
|
|
* WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
|
||
|
|
* MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL THOMAS ROELLm DAVID WEXELBLAT
|
||
|
|
* OR KEAN JOHNSTON BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
|
||
|
|
* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
|
||
|
|
* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
|
||
|
|
* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
|
||
|
|
* THIS SOFTWARE.
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "X.h"
|
||
|
|
|
||
|
|
#define _NEED_SYSI86
|
||
|
|
#include "xf86.h"
|
||
|
|
#include "xf86Priv.h"
|
||
|
|
#include "xf86_OSlib.h"
|
||
|
|
#include "xf86OSpriv.h"
|
||
|
|
|
||
|
|
#ifndef MAP_FAILED
|
||
|
|
#define MAP_FAILED ((void *)-1)
|
||
|
|
#endif
|
||
|
|
|
||
|
|
static Bool
|
||
|
|
linearVidMem(void)
|
||
|
|
{
|
||
|
|
return TRUE;
|
||
|
|
}
|
||
|
|
|
||
|
|
static pointer
|
||
|
|
mapVidMem(int ScreenNum, unsigned long Base, unsigned long Size, int flags)
|
||
|
|
{
|
||
|
|
pointer base;
|
||
|
|
int fd;
|
||
|
|
|
||
|
|
fd = open(DEV_MEM, (flags & VIDMEM_READONLY) ? O_RDONLY : O_RDWR);
|
||
|
|
if (fd < 0) {
|
||
|
|
FatalError("xf86MapVidMem: failed to open %s (%s)\n",
|
||
|
|
DEV_MEM, strerror(errno));
|
||
|
|
}
|
||
|
|
base = mmap((caddr_t)0, Size, (flags & VIDMEM_READONLY) ?
|
||
|
|
PROT_READ : (PROT_READ | PROT_WRITE),
|
||
|
|
MAP_SHARED, fd, (off_t)Base);
|
||
|
|
close(fd);
|
||
|
|
|
||
|
|
if (base == MAP_FAILED) {
|
||
|
|
FatalError("%s: Could not mmap framebuffer [s=%x,a=%x] (%s)\n",
|
||
|
|
"xf86MapVidMem", Size, Base, strerror(errno));
|
||
|
|
}
|
||
|
|
return(base);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* ARGSUSED */
|
||
|
|
static void
|
||
|
|
unmapVidMem(int ScreenNum, pointer Base, unsigned long Size)
|
||
|
|
{
|
||
|
|
munmap(Base, Size);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* For some SVR4 versions, a 32-bit read is done for the first location
|
||
|
|
* in each page when the page is first mapped. If this is done while
|
||
|
|
* memory access is enabled for regions that have read side-effects,
|
||
|
|
* this can cause unexpected results, including lockups on some hardware.
|
||
|
|
* This function is called to make sure each page is mapped while it is
|
||
|
|
* safe to do so.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#define X_PAGE_SIZE 4096
|
||
|
|
|
||
|
|
static void
|
||
|
|
readSideEffects(int ScreenNum, pointer Base, unsigned long Size)
|
||
|
|
{
|
||
|
|
unsigned long base, end, addr;
|
||
|
|
CARD32 val;
|
||
|
|
|
||
|
|
base = (unsigned long)Base;
|
||
|
|
end = base + Size;
|
||
|
|
|
||
|
|
for (addr = base; addr < end; addr += X_PAGE_SIZE)
|
||
|
|
val = *(volatile CARD32 *)addr;
|
||
|
|
}
|
||
|
|
|
||
|
|
void
|
||
|
|
xf86OSInitVidMem(VidMemInfoPtr pVidMem)
|
||
|
|
{
|
||
|
|
pVidMem->linearSupported = linearVidMem();
|
||
|
|
pVidMem->mapMem = mapVidMem;
|
||
|
|
pVidMem->unmapMem = unmapVidMem;
|
||
|
|
pVidMem->readSideEffects = readSideEffects;
|
||
|
|
pVidMem->initialised = TRUE;
|
||
|
|
}
|
||
|
|
|